Steel alloy powder

A technology of alloy steel powder and iron-based alloy, which is applied in the field of alloy steel powder, can solve the problems of not being able to reduce the total cost and increase the manufacturing cost of parts, and achieve the effect of excellent fluidity and low cost

Active Publication Date: 2020-07-17
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, even if the cost of raw materials can be reduced by not using Ni, there is a problem that the manufacturing cost of parts will increase, and as a result, the total cost cannot be reduced.

Method used

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  • Steel alloy powder
  • Steel alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A raw material powder whose component composition and particle size distribution are adjusted is manufactured, and then the raw material powder is heat-treated to manufacture an alloy steel powder. Hereinafter, a specific procedure will be described.

[0083] First, iron-based powders having different component compositions and particle size distributions were produced by a water atomization method as the above-mentioned raw material powders. Table 1 shows the Mo content of the above raw material powder. It should be noted that the Mo content of the raw material powder is equal to the Mo content of the finally obtained alloy steel powder. In addition, the remainder other than Mo is Fe and unavoidable impurities. The above-mentioned raw material powder does not contain Ni, Cr, and Si except for unavoidable impurities, so the contents of Ni, Cr, and Si are each 0.1% by mass or less.

[0084]Table 1 collectively shows the frequency of the number of particles having a pa...

Embodiment 2

[0093] As the above-mentioned raw material powder, an iron-based powder (pre-alloyed steel powder) that further contains one or both of Cu and Mn in addition to Mo, and the remainder is composed of Fe and unavoidable impurities is used. Example 1 identical conditions to manufacture alloy steel powder. The above-mentioned iron-based powder is an atomized iron-based powder produced by an atomization method.

[0094] Table 2 shows the number frequency of particles having a particle size of 20 μm or less contained in the iron-based powder used. The said number frequency was measured by the same method as Example 1.

[0095] Next, the above-mentioned raw material powder was heat-treated under the same conditions as in Example 1 to obtain alloy steel powder. The amounts of Mo, Cu, and Mn contained in the above-mentioned alloy steel powders are the same as those of the raw material powders used, as shown in Table 2.

[0096] Image analysis was performed on each of the obtained all...

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Abstract

Provided is a steel alloy powder with excellent flowability, moldability, and compressibility without containing Ni, Cr, or Si. A steel alloy powder made of a Mo-containing iron-based alloy, wherein:the Mo content in the iron-based alloy is 0.4-1.8 mass%; the weight basis median diameter D50 is at least 40 microns; and, with regard to particles with a circle equivalent diameter of 50-200 micronsamong the particles contained in the steel alloy powder, the number average degree of area envelopment defined as (cross-sectional area of particle / area inside envelope) is 0.70-0.86.

Description

technical field [0001] The present invention relates to an alloy steel powder, in particular to an alloy steel powder having excellent fluidity, formability and compressibility even if it does not contain Ni, Cr, or Si. Background technique [0002] In the powder metallurgy technology, it is possible to manufacture components with complex shapes in a shape very close to the product shape (so-called near-net shape) and with high dimensional accuracy. Therefore, by using powder metallurgy technology to make parts, cutting costs can be greatly reduced. Therefore, powder metallurgy products manufactured by powder metallurgy technology can be used in many fields as various mechanical parts. In addition, recently, in order to cope with the miniaturization, weight reduction and complexity of components, the demand for powder metallurgy technology has further increased. [0003] Against the background as described above, the requirements for alloy steel powders for powder metallur...

Claims

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Application Information

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IPC IPC(8): B22F1/00C22C38/00B22F1/05
CPCC22C33/0264C22C33/0207C22C38/16C22C38/12C22C38/04B22F9/04B22F3/16B22F2009/041B22F2998/10B22F2998/00B22F1/05B22F3/10B22F2201/013B22F2201/20B22F2003/023B22F2003/026B22F9/004
Inventor 高下拓也小林聪雄中村尚道
Owner JFE STEEL CORP
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